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, (No Model.) I v P. O. WRIGHT.

- METAL-DRILLING mavwn. No. 287,986. Patented Nov. 6-, 1883.

Unmet STATES ATENT OFFICE.

u; :PALMER G. \VRIGHT, OF NEW HAVEN, CONNECTICUT.

METAt-DRILLING DEVICE.

SPECIFICATION forming part of Letters Patent No. 287,986, dated November 6, 1883. Application filed April 13, 1883. N6 model.)

To all whom it may concern:

Be it known that I, PALMER O. WRIGHT, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Mechanical Movements as Applied to Drills, of which the following isa specification, reference being had therein to the accompanying drawings.

This invention consists in an improved mechanical movement, as will be hereinafter described and claimed. In the drawings, Figure 1 represents in side elevation my improvement as applied to a drill-stock. Fig. 2 represents a top plan view of Fig. 1. Fig. 3 represents a vertical section on the line 3 3 of Fig. 1. Fig. 4 represents an enlarged plan view of the improvement.

The object of this invention is to produce a mechanical movement to take the place of a ratchet as a feed in the operation of drills. It is found in practice that the, operation of a ratchet is not as positive as is desired; and it is the aim of this invention to secure a positive and noiseless movement of the feed that shall be less expensive and less subject to wear than is a ratchet movement.

A represents the drill stock or socket. Either formed integrally with the drill-stock,

. as shown, or formed separately therefrom and attached thereto, in any suitable manner, is a disk, 0, having an outer circumferential rim, D, and a central boss or ring, F.

G represents a lever or arm whose inner end is formed of such a curved shape that when it is placed in position within the disk 6, as shown in Fig. 4, its inner face or edge,

a, shall impinge against and grip the outer face of the central boss or ring, F, at b, and has a-rearwardly-curved portion, 0, which impinges against and grips the inner face of the rim D. p

H represents a plate-spring, which is secured at one end to the outer edge of the curved portion of the arm G, either by slitting such arm and inserting one end of said spring therein, or by rivetsor other suitable means. The free end of this spring presses against the inner face of the rim D, and serves the double purpose of forcing thecurved portions of said arm or lever into operative contact with the boss or ring F, and also insuring the rotation of the disk and the drill in the proper direction when the arm is turned, as the free end 55 verse movement of the arm or lever, for the purpose of securing a fresh hold, the spring will ride across the face of the rim of the disk without effecting any movement thereof.

I represents a nut or other suitable device for the purpose ofkecping the arm or lever G in position within the recessed disk.

The improvement is especially applicable to hand-operated drills, where the lever or handle, by means of which the drill is rotated, is not revolved entirely around, but where, on the contrary, a partial revolution only is given to the lever, and which is continuously worked back and forth to secure the rotation of the drill.

Having thus described my invention, what I'claim therein is- 1. The disk 0, having outer circumferential rim, D, and boss F, in combination with alever or arm, G, having curved plate-spring H, substantially as and for the purpose set forth. l

2. The combination, with a drill-stock, of

disk 0, having outer circumferential rim, D,

and central ring or boss, F, lever or arm G, having curved inner end, adapted at its 1n-- ner face or edge, a, to grip the outer face of 0 the central boss or ring, F, and having arear wardlycurved portion, 6, adapt-ed to impinge against and grip the inner face of the rim D, and plate-spring H, attached at one end to the outer edge of the curved portion of said arm or lever, and at its free end to impinge against the inner face of.said rim D, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

PALMER O. WRIGHT. Witnesses:

Monnis P. DW'YER, O. A. OAKS. 

